[Freesurfer] FsFast Functional Connectivity with subject-specific surface seeds

Hi Freesurfers,

We are trying to do a resting-state functional connectivity analysis using freesurfer. Instead of using the aparc+aseg segmentations as seeds, we would like to use a subject-specific surface labels that we have defined apriori.

In the fcseed-config step, we then don't have a "segid" as in the anatomical seeds case. What should we specify as the -segid and -seg (segmentation)?

We also looked into the ROI-based options using "-roi" but this takes seeds from output of "funcroi-config" and requires that we specify a contrast and an analysis. How should we just specify a surface label without generating a new analysis and contrast?

Any help or suggestions are appreciated.

Lingqiang